[sdiy] High frequency VCO designs

[Tom Wiltshire]

I'll do the maths and get back to you. I've got all the numbers in a table, but I haven't displayed it as a percentage or in cents.
I was comparing the just intonation frequencies, the Hammond organ frequencies, and the top octave division frequencies. They do differ quite  bit. 2% *is* quite loose, but that particular flavour of out-of-tune is a part of that 70s combo organ sound in the same way that the Hammond out-of-tune flavour is a part of the Hammond sound.

Tom


On 24 Sep 2014, at 21:47, mark verbos <mverbos at earthlink.net> wrote:

> Is it me or do a couple of those pitches sound out of the pocket when he's touching the header?
> 2% is pretty loose.
> 
> Mark
> 
> 
> 
> 
> On Sep 24, 2014, at 6:22 AM, Tom Wiltshire wrote:
> 
>> I'm sure it's been tried lots of ways. A CPLD is the obvious solution in my view, like this:
>> 
>> 	http://majolsurf.net/wordpress/?p=1992
>> 
>> But the PIC way is also cheap and simple, if you can sort out the vibrato clock problem. Hence the original question.
>> 
>> NOS chips and clones seem to cost around £40 - I'm sure I can buy twelve PICs for less than that, and I don't need any dividers. So it's still a reasonable solution, even if not particularly elegant or original.
>> 
>> Tom
>> 
>> On 24 Sep 2014, at 08:35, Oakley Sound <oakleylist at btinternet.com> wrote:
>> 
>>> Some one has had a go of this already. I've not tried it, but his other little octave chiplets are very useful.
>>> 
>>> http://www.flatkeys.co.uk/MK50240.html
>>> 
>>> Tony
>>> 
>>> http://www.oakleysound.com                 DIY Synths
>>> http://takla-makan.bandcamp.com            My Music
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>